Answer
$x^2-9y^2$
Work Step by Step
Recall the difference of two squares formula:
$(a-b)(a+b)=a^2-b^2$
By applying this formula, we get:
$$
(x + 3y)(x - 3y)= x^2-(3y)^2=x^2-9y^2
.$$
Precalculus: Concepts Through Functions, A Unit Circle Approach to Trigonometry (3rd Edition)
by Sullivan III, Michael
Published by
Pearson
ISBN 10:
0-32193-104-1
ISBN 13:
978-0-32193-104-7
Appendix A - Review - A.3 Polynomials - A.3 Assess Your Understanding - Page A31: 78
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